There could be any multitude of reasons why the pilot doesn't light
A gas engineer would systematically work through the fault finding guide to try to figure out what the problem is
http://library.plumbase.co.uk/flipbooks/RE/pttpro30e_20452_t/mobile/index.html#p=27
Does fan operate YES/NO
Has overheat tripped YES/NO
Is PCB FUSE ok YES/NO
Etc etc
With the limited amount of information provided by you
You don't have any option other than to call a gas engineer out to
1 diagnose the fault
2 repair the fault
Anon, December 2018
